Transmission for vehicle

Abstract

A transmission includes: a pre-engaging mechanism including a plurality of pre-engaging gear pairs engaged with a second input shaft, a first countershaft, and a second countershaft so that the pre-engaging gear pairs are appropriately selected by a clutch unit; a synchro-engaging mechanism including a plurality of synchro-engaging gear pairs engaged with a third input shaft, the first countershaft, and the second countershaft so that the synchro-engaging gear pairs are appropriately selected by a clutch unit; a one-way clutch positioned on a corresponding power transmission path so that power transmitted through the first input shaft from the engine is transmitted only to the third input shaft; and a main shifting mechanism including a plurality of main gear pairs engaged with the first countershaft, the second countershaft, and an output shaft so that the main gear pairs are appropriately selected by a clutch.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application claims priority to Korean Patent Application No. 10-2016-0095147, filed Jul. 27, 2016, the entire contents of which is incorporated herein for all purposes by this reference.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention provides a transmission for a vehicle, whereby the transmission reduces poor shifting that causes a phenomenon such as pulling of a vehicle during shifting.Description of the Related Art[0003]An automated manual transmission can provide convenience for a driver, similar to an automatic transmission, by providing automatic shifting by an actuator while the vehicle is driven, and can contribute to improving fuel efficiency of the vehicle while maintaining power transmission efficiency higher than an automatic transmission.[0004]However, for an automated manual transmission based on a synchro-mesh type shifting mechanism, there is necessary a period where power from an eng...

AI Technical Summary

Benefits of technology

[0007]Various aspects of the present invention are directed to providing a transmission for the vehicle, whereby the transmission may have a simple structure and provides many shifting steps without disconnection during shifting which causes a phenomenon including pulling of the vehicle during shifting.

[0019]As described above, while shifting to a desired gear stage from the current gear stage is performed, the one-way clutch absorbs the difference in rotational speed due to the difference in gear ratio of the gear stages at the point of time when the torque from the synchro-engaging gear pairs is switched to the pre-engaging gear pairs, thereby preventing poor shifting that causes a phenomenon including pulling of the vehicle during shifting.

[0020]Further, the pre-engaging gear pairs and the synchro-engaging gear pairs have a plurality of stages having different gear ratios, whereby the number of gear stages that can be achieved by combination with the main gear pairs is greatly increased in proportion to the number of stages of the pre-engaging gear pairs and the synchro-engaging gear pairs. Accordingly, it is possible to achieve many gear stages from the transmission without largely increasing the entire length of the transmission.

Problems solved by technology

However, for an automated manual transmission based on a synchro-mesh type shifting mechanism, there is necessary a period where power from an engine is disconnected while automatic shifting is performed by an actuator that shifts gears, so torque is decreased and the shifting ability is deteriorated resulting in, for example, a backward pulling effect of the vehicle when shifting.

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